Valve Train

Engine, Transmission and related drivetrain.
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CP
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Location: Port Coquitlam, BC, Canada

Re: Valve Train

Post by CP » 17 Aug 2018 22:24

Well, the proof is in the pudding
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bertvorgon
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Re: Valve Train

Post by bertvorgon » 18 Aug 2018 07:07

At least you know now, better it happened here than on one of our drives, 400 miles from home. Sorry that happened though.

Good time to go through that whole head I would say.
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Keith Law
1973 2Door Slalom/hill climb/road race / canyon carver /Giant Killer 510
1968 Vintage 3HP Mini Bike
1971 Vintage 13' BOLER trailer

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CP
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Location: Port Coquitlam, BC, Canada

Re: Valve Train

Post by CP » 21 Aug 2018 18:55

Can anyone tell me a bit about valve seats? It appears our seats are Bronze. Is this stock? Should the replacements be Bronze or is there something better?

Three B's Racing
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Re: Valve Train

Post by Three B's Racing » 22 Aug 2018 04:53

CP wrote:
21 Aug 2018 18:55
Can anyone tell me a bit about valve seats? It appears our seats are Bronze. Is this stock? Should the replacements be Bronze or is there something better?
Bronze is original or someone didn't know any better and replaced old seats with original old seats. Steel seats are now used because of no lead in gas which is why your valve seat failed as it got pounded out of shape (soft brass) and lost it's press fit.
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Byron510
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Re: Valve Train

Post by Byron510 » 22 Aug 2018 21:18

Stellite is the trade name for the alloy most commonly used on quality newer seats. Your exhaust seats are likely cast iron, I’d have these changed at the same time to stellite as well.

If it’s a U67 head, I’d upgrade the intake valves from the stock 42mm to the 280z 44mm, and the exhaust 34mm to the 280z 35mm valves and have the seats matched if you want a little more breathing from the head. If you’re replacing them anyways, the costs is the same.

Just a thought.

Byron
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because the opposite never works.

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CP
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Location: Port Coquitlam, BC, Canada

Re: Valve Train

Post by CP » 22 Aug 2018 21:59

Thanks for the info. It is actually an A87 head, which I thought I read might be a bit better suited to the 2.2 liter block.

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Byron510
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Re: Valve Train

Post by Byron510 » 22 Aug 2018 22:20

Any head built prior to 1978 I believe had the Bronze intake & cast iron exhaust seats, so that makes sense.

Byron
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because the opposite never works.

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